This chapter is from the book

This chapter covers the Border Gateway Protocol (BGP), which is used to exchange routes between autonomous systems. It is most frequently used between enterprises and service providers. The "Route Manipulation" section covers route summarization and redistribution of route information between routing protocols. The CCDA should know where redistribution occurs when required by the network design. This chapter also reviews policy-based routing (PBR) as a method to change the destination IP address based on policies. Finally, this chapter covers IP multicast protocols.

"Do I Know This Already?" Quiz

The purpose of the "Do I Know This Already?" quiz is to help you decide whether you need to read the entire chapter. If you intend to read the entire chapter, you do not necessarily need to answer these questions now.

The eight-question quiz, derived from the major sections in the "Foundation Topics" portion of the chapter, helps you determine how to spend your limited study time.

Table 12-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or you are only partially sure, you should mark this question wrong for the purposes of the self-assessment. Giving yourself credit for an answer you correctly guess skews your self-assessment results and might give you a false sense of security.

What protocol do you use to exchange IP routes between autonomous systems?

IGMP

eBGP

IGRP

OSPF

What is the current version of BGP?

BGP Version 2

BGP Version 3

BGP Version 4

BGP Version 1

Where should routes be summarized?

On the core routers

On the distribution routers

On the access routers

None of the above

What is PBR?

Public-Broadcast Routing

Private-Based Routing

Policy-Broadcast Routing

Policy-Based Routing

What is IGMP?

Interior Group Management Protocol

Internet Group Management Protocol

Interior Gateway Routing Protocol

Interior Gateway Media Protocol

How many bits are mapped from the Layer 3 IPv4 multicast address to a Layer 2 MAC address?

16 bits

23 bits

24 bits

32 bits

What is the administrative distance of eBGP routes?

20

100

110

200

What is CIDR?

Classful Intradomain Routing

Classful Interior Domain Routing

Classless Intradomain Routing

Classless Interdomain Routing

The answers to the "Do I Know This Already?" quiz appear in Appendix A, "Answers to Chapter 'Do I Know This Already?' Quizzes and Q&A Sections." The suggested choices for your next step are as follows:

6 or less overall score—Read the entire chapter. It includes the "Foundation Topics," "Foundation Summary," and "Q&A" sections.

7 or 8 overall score—If you want more review on these topics, skip to the "Foundation Summary" section and then go to the "Q&A" section. Otherwise, move to the next chapter.